condition mean min max 4 h after light 18.8 18.8 18.8 8 h after light 7.949999999999999 6.2 9.7 12 h after light 4.05 4.0 4.1 4 h after dark 6.4 5.5 7.3 8 h after dark 4.6 4.3 4.9 12 h after dark 14.7 8.2 21.2